using System;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Linq;
using System.Xml.Serialization;
using Microsoft.AspNetCore.Mvc.ApiExplorer;
using Microsoft.AspNetCore.Mvc.Formatters;

namespace Win_in.Sfs.Scp.WebApi.XmlHost
{
    public class XDocumentInputFormatter : InputFormatter, IInputFormatter, IApiRequestFormatMetadataProvider
    {
        private Type currentType { get; set; }
        public XDocumentInputFormatter()
        {
            SupportedMediaTypes.Add("application/xml");
        }

        protected override bool CanReadType(Type type)
        {
            currentType = type;
            if (type.IsAssignableFrom(typeof(XDocument))) return true;
            return base.CanReadType(type);
        }


        public override async Task<InputFormatterResult> ReadRequestBodyAsync(InputFormatterContext context)
        {
            // Use StreamReader to convert any encoding to UTF-16 (default C# and sql Server).
            using var streamReader = new StreamReader(context.HttpContext.Request.Body);
            var xmlDoc = await XDocument.LoadAsync(streamReader, LoadOptions.None, CancellationToken.None);
            var model = new XmlSerializer(currentType).Deserialize(xmlDoc.CreateReader());
            return await InputFormatterResult.SuccessAsync(model);
        }

    }
    
}